Solution: Total number of outcomes when die is thrown twice = 6 × 6 = 36. (i) Number of possible outcomes when 5 will come up either time = (5, 1), (5, 2), (5, 3), (5, 4), (5, 5), (5, 6), (1, 5), (2, 5), (3, 5), (4, 5), (6, 5) = 11 Probability that 5 will come up either time = Number of possible outcomes/Total number of favourable outcomes = 11/36 The probability that 5 will not come up either time = 1 - 11/36 = 25/36 (ii) Number of possible outcomes when 5 will come up at least once = 11 The probability that 5 comes up at least once = Number of possible outcomes/Total number of favourable outcomes = 11/36 The probability that 5 will not come up either time is 25/36 and the probability that 5 will come up is 11/36. Check out more about terms of probability. ☛ Check: NCERT Solutions for Class 10 Maths Chapter 15 Video Solution: A die is thrown twice. What is the probability that (i) 5 will not come up either time? (ii) 5 will come up at least once? [Hint : Throwing a die twice and throwing two dice simultaneously are treated as the same experiment]NCERT Solutions for Class 10 Maths Chapter 15 Exercise 15.1 Question 24 Summary: A die is thrown twice.The probability that (i) 5 will not come up either time is 25/36 and (ii) 5 will come up at least once is 11/36 ☛ Related Questions: |